Transformer Protection: NPT916
The NPT916 relay is designed to protect transformers or provide differential protection across rotating machines.   It is modular and customisable with one or two I/O or communication cards.

The NPT916 provides low- or high-side elements for overcurrent, earth-fault and negative sequence.  It has two independent restricted earth-fault (REF) elements.

Do you need voltage regulation for your transformer?  Consider the NPTA915.

ANSI functions for NPT916: 
87T / 87N / 49T / 50 / 51 / 50N / 51N (S)/ 50H / 51H / 68H / 46 / 46R / 46L / 50BF / 52BF / 74TC

This relay is part of the NP900 range, offering multi-function protection and communication using IEC61850, GOOSE and MODBUS protocols (Ethernet and fibre optic communication options available).  A full brochure is available on the NP900 range page